Niluardo Cay, M.D.
NPI 1588766646 · Internal Medicine Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Niluardo Cay, M.D. is a Internal Medicine Physician provider in Chicago, IL (NPI 1588766646).
Provider details
- NPI number
- 1588766646
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 036056545 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
387 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 227 | $130 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 106 | $52 |
| Initial Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99221 | 41 | $87 |
| Physician Or Allowed Practitioner Certification for Medicare-Covered Home Health Services Under a Home Health Plan of Care (patient Not Present), Including Contacts With Home Health Agency and Review of Reports of Patient Status Required By Physicians andG0180 | 13 | $55 |
Typical Medicare-allowed amounts for these services range $52–$130 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 32 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 135 | 52 |
| Amlodipine Besylate | 120 | 40 |
| Metoprolol Succinate | 97 | 32 |
| Lisinopril | 61 | 20 |
| Metformin Hcl | 60 | 22 |
| Hydrochlorothiazide | 42 | 19 |
| Irbesartan | 39 | 13 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-01
- Last updated
- 2008-06-20
Frequently asked questions
- What is Niluardo Cay's NPI number?
- Niluardo Cay's National Provider Identifier (NPI) is 1588766646, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Niluardo Cay's specialty?
- Niluardo Cay is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Niluardo Cay located?
- Niluardo Cay's practice location on file with NPPES is 1431 N Western Ave, Chicago, IL 60622-1797.
- What is Niluardo Cay's phone number?
- The practice phone number listed in the NPPES registry for Niluardo Cay is (773) 235-5391.
- Does Niluardo Cay accept Medicare?
- Niluardo Cay is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Niluardo Cay's NPI active?
- Yes — Niluardo Cay's NPI (1588766646) is active in the NPPES registry as of the last update on 2008-06-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.